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`SiO_(2)` or ordinary sand reacts with

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`SiO_(2)` or ordinary sand reacts with
A. Conc.HCl
B. HF
C. NaOH (hot)
D. `CO_(2)`
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Correct Answer - B::C
`SiO_(2)` reacts with HF and NaOH
`SiO_(2) +4HF to SiF_(4)+2H_(2)O`
`SiO_(2)+2NaOH to Na_(2)SiO_(3)+H_(2)O`
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